X = int(input())
if (X >= 30) and (X <= 40):
    print("Yes")
else:
    print("No") X = int(input()) X int(input()) int input() input if (X >= 30) and (X <= 40):
    print("Yes")
else:
    print("No") (X >= 30) and (X <= 40) X >= 30 X 30 X <= 40 X 40 print("Yes") print "Yes" print("No") print "No" X = int(input()) int(input()) X
X = int(input())
if (X >= 30) and (X <= 40):
    print("Yes")
else:
    print("No")